[Tarto]

It says that the "靴下にゃんこ" campaign is held at the shops that display that kitty-head mark.

靴下にゃんこ:
- 靴下 means socks
- にゃんこ is a "cute" way to say "cat"
In this case, I assume it's just the name of the campaign.

It doesn't tell anything about what the campaign's about, though.